What are Java generics?

Java Generics is a feature introduced in Java 5 that allows for type-safe collections and other types. They allow you to write a single class or method that can work with multiple types of data, rather than having to write a separate version of the class or method for each type. This can lead to more reusable and maintainable code.

Here is an example of a simple generic class in Java:

public class Box {
    private T t;

    public void add(T t) {
        this.t = t;
    }

    public T get() {
        return t;
    }
}

In this example, the class "Box" is parameterized with a type "T". The type "T" is used as a placeholder for an actual type that will be specified when an object of the "Box" class is created. The class can be used to create boxes that can hold any type of object, such as "Box" or "Box".